Glossary
©
National Instruments Corporation
G-9
DAQMeter DAQCard-4050 User Manual
rms
root mean square—a measure of signal amplitude; the square root of the
average value of the square of the instantaneous signal amplitude
ROM
read-only memory
S
s
seconds
S
samples
settling time
the amount of time required for a voltage to reach its final value within
specified limits
SNR
signal-to-noise ratio–the ratio of the overall rms signal level to the rms
noise level, expressed in dB
S/s
samples per second—used to express the rate at which a DAQ board
samples an analog signal
system noise
a measure of the amount of noise seen by an analog circuit or an ADC
when the analog inputs are grounded
T
temperature
the percentage that a measurement will vary according to temperature.
coefficient
See also thermal drift.
thermal drift
measurements that changes as the temperature varies
thermoelectric
See thermal EMFs.
potentials
thermal EMFs
thermal electromotive forces—voltages generated at the junctions of
dissimilar metals that are functions of temperature. Also called
thermoelectric potentials.
transfer rate
the rate, measured in bytes/s, at which data is moved from source to
destination after software initialization and set up operations; the
maximum rate at which the hardware can operate
